HttpHelper类源码，方便网络抓取

bestbobo · 发表于 2016-3-30 14:56:56

public class HttpHelper
{
#region 预定义方变量
//默认的编码
private Encoding encoding = Encoding.Default;
//Post数据编码
private Encoding postencoding = Encoding.Default;
//HttpWebRequest对象用来发起请求
private HttpWebRequest request = null;
//获取影响流的数据对象
private HttpWebResponse response = null;
#endregion
#region Public
/// <summary>
/// 根据相传入的数据，得到相应页面数据
/// </summary>
/// <param name="item">参数类对象</param>
/// <returns>返回HttpResult类型</returns>
public HttpResult GetHtml(HttpItem item)
{
//返回参数
HttpResult result = new HttpResult();
try
{
//准备参数
SetRequest(item);
}
catch (Exception ex)
{
result.Cookie = string.Empty;
result.Header = null;
result.Html = ex.Message;
result.StatusDescription = "配置参数时出错：" + ex.Message;
//配置参数时出错
return result;
}
try
{
//request.KeepAlive = true;
//请求数据
using(response = (HttpWebResponse)request.GetResponse())
GetData(item, result);
}
catch (WebException ex)
{
if (ex.Response != null)
{
using(response = (HttpWebResponse)ex.Response)
GetData(item, result);
}
else
{
result.Html = ex.Message;
}
}
catch (Exception ex)
{
result.Html = ex.Message;
}
if (item.IsToLower) result.Html = result.Html.ToLower();
return result;
}
#endregion
#region GetData
/// <summary>
/// 获取数据的并解析的方法
/// </summary>
/// <param name="item"></param>
/// <param name="result"></param>
private void GetData(HttpItem item, HttpResult result)
{
#region base
//获取StatusCode
result.StatusCode = response.StatusCode;
//获取StatusDescription
result.StatusDescription = response.StatusDescription;
//获取Headers
result.Header = response.Headers;
//获取CookieCollection
if (response.Cookies != null) result.CookieCollection = response.Cookies;
//获取set-cookie
if (response.Headers["set-cookie"] != null) result.Cookie = response.Headers["set-cookie"];
#endregion
#region byte
//处理网页Byte
byte[] ResponseByte = GetByte();
#endregion
#region Html
if (ResponseByte != null & ResponseByte.Length > 0)
{
//设置编码
SetEncoding(item, result, ResponseByte);
//得到返回的HTML
result.Html = encoding.GetString(ResponseByte);
}
else
{
//没有返回任何Html代码
result.Html = string.Empty;
}
#endregion
}
/// <summary>
/// 设置编码
/// </summary>
/// <param name="item">HttpItem</param>
/// <param name="result">HttpResult</param>
/// <param name="ResponseByte">byte[]</param>
private void SetEncoding(HttpItem item, HttpResult result, byte[] ResponseByte)
{
//是否返回Byte类型数据
if (item.ResultType == ResultType.Byte) result.ResultByte = ResponseByte;
//从这里开始我们要无视编码了
if (encoding == null)
{
Match meta = Regex.Match(Encoding.Default.GetString(ResponseByte), "<meta[^<]*charset=([^<]*)[\"']", RegexOptions.IgnoreCase);
string c = string.Empty;
if (meta != null && meta.Groups.Count > 0)
{
c = meta.Groups[1].Value.ToLower().Trim();
}
if (c.Length > 2)
{
try
{
encoding = Encoding.GetEncoding(c.Replace("\"", string.Empty).Replace("'", "").Replace(";", "").Replace("iso-8859-1", "gbk").Trim());
}
catch
{
if (string.IsNullOrEmpty(response.CharacterSet))
{
encoding = Encoding.UTF8;
}
else
{
encoding = Encoding.GetEncoding(response.CharacterSet);
}
}
}
else
{
if (string.IsNullOrEmpty(response.CharacterSet))
{
encoding = Encoding.UTF8;
}
else
{
encoding = Encoding.GetEncoding(response.CharacterSet);
}
}
}
}
/// <summary>
/// 提取网页Byte
/// </summary>
/// <returns></returns>
private byte[] GetByte()
{
byte[] ResponseByte = null;
MemoryStream _stream = new MemoryStream();
//GZIIP处理
if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
{
//开始读取流并设置编码方式
_stream = GetMemoryStream(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress));
}
else
{
//开始读取流并设置编码方式
_stream = GetMemoryStream(response.GetResponseStream());
}
//获取Byte
ResponseByte = _stream.ToArray();
_stream.Close();
return ResponseByte;
}
/// <summary>
/// 4.0以下.net版本取数据使用
/// </summary>
/// <param name="streamResponse">流</param>
private MemoryStream GetMemoryStream(Stream streamResponse)
{
MemoryStream _stream = new MemoryStream();
int Length = 256;
Byte[] buffer = new Byte[Length];
int bytesRead = streamResponse.Read(buffer, 0, Length);
while (bytesRead > 0)
{
_stream.Write(buffer, 0, bytesRead);
bytesRead = streamResponse.Read(buffer, 0, Length);
}
return _stream;
}
#endregion
#region SetRequest
/// <summary>
/// 为请求准备参数
/// </summary>
///<param name="item">参数列表</param>
private void SetRequest(HttpItem item)
{
// 验证证书
SetCer(item);
//设置Header参数
if (item.Header != null && item.Header.Count > 0) foreach (string key in item.Header.AllKeys)
{
request.Headers.Add(key, item.Header[key]);
}
// 设置代理
SetProxy(item);
if (item.ProtocolVersion != null) request.ProtocolVersion = item.ProtocolVersion;
request.ServicePoint.Expect100Continue = item.Expect100Continue;
//请求方式Get或者Post
request.Method = item.Method;
request.Timeout = item.Timeout;
request.KeepAlive = item.KeepAlive;
request.ReadWriteTimeout = item.ReadWriteTimeout;
if (item.IfModifiedSince != null) request.IfModifiedSince = Convert.ToDateTime(item.IfModifiedSince);
//Accept
request.Accept = item.Accept;
//ContentType返回类型
request.ContentType = item.ContentType;
//UserAgent客户端的访问类型，包括浏览器版本和操作系统信息
request.UserAgent = item.UserAgent;
// 编码
encoding = item.Encoding;
//设置安全凭证
request.Credentials = item.ICredentials;
//设置Cookie
SetCookie(item);
//来源地址
request.Referer = item.Referer;
//是否执行跳转功能
request.AllowAutoRedirect = item.Allowautoredirect;
if (item.MaximumAutomaticRedirections > 0)
{
request.MaximumAutomaticRedirections = item.MaximumAutomaticRedirections;
}
//设置Post数据
SetPostData(item);
//设置最大连接
if (item.Connectionlimit > 0) request.ServicePoint.ConnectionLimit = item.Connectionlimit;
}
/// <summary>
/// 设置证书
/// </summary>
/// <param name="item"></param>
private void SetCer(HttpItem item)
{
if (!string.IsNullOrEmpty(item.CerPath))
{
//这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。
ServicePointManager.ServerCertificateValIDAtionCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
//初始化对像，并设置请求的URL地址
request = (HttpWebRequest)WebRequest.Create(item.URL);
SetCerList(item);
//将证书添加到请求里
request.ClientCertificates.Add(new X509Certificate(item.CerPath));
}
else
{
//初始化对像，并设置请求的URL地址
request = (HttpWebRequest)WebRequest.Create(item.URL);
SetCerList(item);
}
}
/// <summary>
/// 设置多个证书
/// </summary>
/// <param name="item"></param>
private void SetCerList(HttpItem item)
{
if (item.ClentCertificates != null && item.ClentCertificates.Count > 0)
{
foreach (X509Certificate c in item.ClentCertificates)
{
request.ClientCertificates.Add(c);
}
}
}
/// <summary>
/// 设置Cookie
/// </summary>
/// <param name="item">Http参数</param>
private void SetCookie(HttpItem item)
{
if (!string.IsNullOrEmpty(item.Cookie)) request.Headers[HttpRequestHeader.Cookie] = item.Cookie;
//设置CookieCollection
if (item.ResultCookieType == ResultCookieType.CookieCollection)
{
request.CookieContainer = new CookieContainer();
if (item.CookieCollection != null && item.CookieCollection.Count > 0)
request.CookieContainer.Add(item.CookieCollection);
}
}
/// <summary>
/// 设置Post数据
/// </summary>
/// <param name="item">Http参数</param>
private void SetPostData(HttpItem item)
{
//验证在得到结果时是否有传入数据
if (!request.Method.Trim().ToLower().Contains("get"))
{
if (item.PostEncoding != null)
{
postencoding = item.PostEncoding;
}
byte[] buffer = null;
//写入Byte类型
if (item.PostDataType == PostDataType.Byte && item.PostdataByte != null && item.PostdataByte.Length > 0)
{
//验证在得到结果时是否有传入数据
buffer = item.PostdataByte;
}//写入文件
else if (item.PostDataType == PostDataType.FilePath && !string.IsNullOrEmpty(item.Postdata))
{
StreamReader r = new StreamReader(item.Postdata, postencoding);
buffer = postencoding.GetBytes(r.ReadToEnd());
r.Close();
} //写入字符串
else if (!string.IsNullOrEmpty(item.Postdata))
{
buffer = postencoding.GetBytes(item.Postdata);
}
if (buffer != null)
{
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
}
}
}
/// <summary>
/// 设置代理
/// </summary>
/// <param name="item">参数对象</param>
private void SetProxy(HttpItem item)
{
bool isIeProxy = false;
if (!string.IsNullOrEmpty(item.ProxyIp))
{
isIeProxy = item.ProxyIp.ToLower().Contains("ieproxy");
}
if (!string.IsNullOrEmpty(item.ProxyIp) && !isIeProxy)
{
//设置代理服务器
if (item.ProxyIp.Contains(":"))
{
string[] plist = item.ProxyIp.Split(':');
WebProxy myProxy = new WebProxy(plist[0].Trim(), Convert.ToInt32(plist[1].Trim()));
//建议连接
myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
//给当前请求对象
request.Proxy = myProxy;
}
else
{
WebProxy myProxy = new WebProxy(item.ProxyIp, false);
//建议连接
myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
//给当前请求对象
request.Proxy = myProxy;
}
}
else if (isIeProxy)
{
//设置为IE代理
}
else
{
request.Proxy = item.WebProxy;
}
}
#endregion
#region private main
/// <summary>
/// 回调验证证书问题
/// </summary>
/// <param name="sender">流对象</param>
/// <param name="certificate">证书</param>
/// <param name="chain">X509Chain</param>
/// <param name="errors">SslPolicyErrors</param>
/// <returns>bool</returns>
private bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; }
#endregion
}
/// <summary>
/// Http请求参考类
/// </summary>
public class HttpItem
{
string _URL = string.Empty;
/// <summary>
/// 请求URL必须填写
/// </summary>
public string URL
{
get { return _URL; }
set { _URL = value; }
}
string _Method = "GET";
/// <summary>
/// 请求方式默认为GET方式,当为POST方式时必须设置Postdata的值
/// </summary>
public string Method
{
get { return _Method; }
set { _Method = value; }
}
int _Timeout = 100000;
/// <summary>
/// 默认请求超时时间
/// </summary>
public int Timeout
{
get { return _Timeout; }
set { _Timeout = value; }
}
int _ReadWriteTimeout = 30000;
/// <summary>
/// 默认写入Post数据超时间
/// </summary>
public int ReadWriteTimeout
{
get { return _ReadWriteTimeout; }
set { _ReadWriteTimeout = value; }
}
Boolean _KeepAlive = true;
/// <summary>
/// 获取或设置一个值，该值指示是否与 Internet 资源建立持久性连接默认为true。
/// </summary>
public Boolean KeepAlive
{
get { return _KeepAlive; }
set { _KeepAlive = value; }
}
string _Accept = "text/html, application/xhtml+xml, */*";
/// <summary>
/// 请求标头值默认为text/html, application/xhtml+xml, */*
/// </summary>
public string Accept
{
get { return _Accept; }
set { _Accept = value; }
}
string _ContentType = "text/html";
/// <summary>
/// 请求返回类型默认 text/html
/// </summary>
public string ContentType
{
get { return _ContentType; }
set { _ContentType = value; }
}
string _UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)";
/// <summary>
/// 客户端访问信息默认Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
/// </summary>
public string UserAgent
{
get { return _UserAgent; }
set { _UserAgent = value; }
}
Encoding _Encoding = null;
/// <summary>
/// 返回数据编码默认为NUll,可以自动识别,一般为utf-8,gbk,gb2312
/// </summary>
public Encoding Encoding
{
get { return _Encoding; }
set { _Encoding = value; }
}
private PostDataType _PostDataType = PostDataType.String;
/// <summary>
/// Post的数据类型
/// </summary>
public PostDataType PostDataType
{
get { return _PostDataType; }
set { _PostDataType = value; }
}
string _Postdata = string.Empty;
/// <summary>
/// Post请求时要发送的字符串Post数据
/// </summary>
public string Postdata
{
get { return _Postdata; }
set { _Postdata = value; }
}
private byte[] _PostdataByte = null;
/// <summary>
/// Post请求时要发送的Byte类型的Post数据
/// </summary>
public byte[] PostdataByte
{
get { return _PostdataByte; }
set { _PostdataByte = value; }
}
private WebProxy _WebProxy;
/// <summary>
/// 设置代理对象，不想使用IE默认配置就设置为Null，而且不要设置ProxyIp
/// </summary>
public WebProxy WebProxy
{
get { return _WebProxy; }
set { _WebProxy = value; }
}
CookieCollection cookiecollection = null;
/// <summary>
/// Cookie对象集合
/// </summary>
public CookieCollection CookieCollection
{
get { return cookiecollection; }
set { cookiecollection = value; }
}
string _Cookie = string.Empty;
/// <summary>
/// 请求时的Cookie
/// </summary>
public string Cookie
{
get { return _Cookie; }
set { _Cookie = value; }
}
string _Referer = string.Empty;
/// <summary>
/// 来源地址，上次访问地址
/// </summary>
public string Referer
{
get { return _Referer; }
set { _Referer = value; }
}
string _CerPath = string.Empty;
/// <summary>
/// 证书绝对路径
/// </summary>
public string CerPath
{
get { return _CerPath; }
set { _CerPath = value; }
}
private Boolean isToLower = false;
/// <summary>
/// 是否设置为全文小写，默认为不转化
/// </summary>
public Boolean IsToLower
{
get { return isToLower; }
set { isToLower = value; }
}
private Boolean allowautoredirect = false;
/// <summary>
/// 支持跳转页面，查询结果将是跳转后的页面，默认是不跳转
/// </summary>
public Boolean Allowautoredirect
{
get { return allowautoredirect; }
set { allowautoredirect = value; }
}
private int connectionlimit = 1024;
/// <summary>
/// 最大连接数
/// </summary>
public int Connectionlimit
{
get { return connectionlimit; }
set { connectionlimit = value; }
}
private string proxyusername = string.Empty;
/// <summary>
/// 代理Proxy 服务器用户名
/// </summary>
public string ProxyUserName
{
get { return proxyusername; }
set { proxyusername = value; }
}
private string proxypwd = string.Empty;
/// <summary>
/// 代理服务器密码
/// </summary>
public string ProxyPwd
{
get { return proxypwd; }
set { proxypwd = value; }
}
private string proxyip = string.Empty;
/// <summary>
/// 代理服务IP ,如果要使用IE代理就设置为ieproxy
/// </summary>
public string ProxyIp
{
get { return proxyip; }
set { proxyip = value; }
}
private ResultType resulttype = ResultType.String;
/// <summary>
/// 设置返回类型String和Byte
/// </summary>
public ResultType ResultType
{
get { return resulttype; }
set { resulttype = value; }
}
private WebHeaderCollection header = new WebHeaderCollection();
/// <summary>
/// header对象
/// </summary>
public WebHeaderCollection Header
{
get { return header; }
set { header = value; }
}
private Version _ProtocolVersion;
/// <summary>
// 获取或设置用于请求的 HTTP 版本。返回结果:用于请求的 HTTP 版本。默认为 System.Net.HttpVersion.Version11。
/// </summary>
public Version ProtocolVersion
{
get { return _ProtocolVersion; }
set { _ProtocolVersion = value; }
}
private Boolean _expect100continue = true;
/// <summary>
/// 获取或设置一个 System.Boolean 值，该值确定是否使用 100-Continue 行为。如果 POST 请求需要 100-Continue 响应，则为 true；否则为 false。默认值为 true。
/// </summary>
public Boolean Expect100Continue
{
get { return _expect100continue; }
set { _expect100continue = value; }
}
private X509CertificateCollection _ClentCertificates;
/// <summary>
/// 设置509证书集合
/// </summary>
public X509CertificateCollection ClentCertificates
{
get { return _ClentCertificates; }
set { _ClentCertificates = value; }
}
private Encoding _PostEncoding;
/// <summary>
/// 设置或获取Post参数编码,默认的为Default编码
/// </summary>
public Encoding PostEncoding
{
get { return _PostEncoding; }
set { _PostEncoding = value; }
}
private ResultCookieType _ResultCookieType = ResultCookieType.String;
/// <summary>
/// Cookie返回类型,默认的是只返回字符串类型
/// </summary>
public ResultCookieType ResultCookieType
{
get { return _ResultCookieType; }
set { _ResultCookieType = value; }
}
private ICredentials _ICredentials = CredentialCache.DefaultCredentials;
/// <summary>
/// 获取或设置请求的身份验证信息。
/// </summary>
public ICredentials ICredentials
{
get { return _ICredentials; }
set { _ICredentials = value; }
}
/// <summary>
/// 设置请求将跟随的重定向的最大数目
/// </summary>
private int _MaximumAutomaticRedirections;
public int MaximumAutomaticRedirections
{
get { return _MaximumAutomaticRedirections; }
set { _MaximumAutomaticRedirections = value; }
}
private DateTime? _IfModifiedSince = null;
/// <summary>
/// 获取和设置IfModifiedSince，默认为当前日期和时间
/// </summary>
public DateTime? IfModifiedSince
{
get { return _IfModifiedSince; }
set { _IfModifiedSince = value; }
}
}
/// <summary>
/// Http返回参数类
/// </summary>
public class HttpResult
{
private string _Cookie;
/// <summary>
/// Http请求返回的Cookie
/// </summary>
public string Cookie
{
get { return _Cookie; }
set { _Cookie = value; }
}
private CookieCollection _CookieCollection;
/// <summary>
/// Cookie对象集合
/// </summary>
public CookieCollection CookieCollection
{
get { return _CookieCollection; }
set { _CookieCollection = value; }
}
private string _html = string.Empty;
/// <summary>
/// 返回的String类型数据只有ResultType.String时才返回数据，其它情况为空
/// </summary>
public string Html
{
get { return _html; }
set { _html = value; }
}
private byte[] _ResultByte;
/// <summary>
/// 返回的Byte数组只有ResultType.Byte时才返回数据，其它情况为空
/// </summary>
public byte[] ResultByte
{
get { return _ResultByte; }
set { _ResultByte = value; }
}
private WebHeaderCollection _Header;
/// <summary>
/// header对象
/// </summary>
public WebHeaderCollection Header
{
get { return _Header; }
set { _Header = value; }
}
private string _StatusDescription;
/// <summary>
/// 返回状态说明
/// </summary>
public string StatusDescription
{
get { return _StatusDescription; }
set { _StatusDescription = value; }
}
private HttpStatusCode _StatusCode;
/// <summary>
/// 返回状态码,默认为OK
/// </summary>
public HttpStatusCode StatusCode
{
get { return _StatusCode; }
set { _StatusCode = value; }
}
}
/// <summary>
/// 返回类型
/// </summary>
public enum ResultType
{
/// <summary>
/// 表示只返回字符串只有Html有数据
/// </summary>
String,
/// <summary>
/// 表示返回字符串和字节流 ResultByte和Html都有数据返回
/// </summary>
Byte
}
/// <summary>
/// Post的数据格式默认为string
/// </summary>
public enum PostDataType
{
/// <summary>
/// 字符串类型，这时编码Encoding可不设置
/// </summary>
String,
/// <summary>
/// Byte类型，需要设置PostdataByte参数的值编码Encoding可设置为空
/// </summary>
Byte,
/// <summary>
/// 传文件，Postdata必须设置为文件的绝对路径，必须设置Encoding的值
/// </summary>
FilePath
}
/// <summary>
/// Cookie返回类型
/// </summary>
public enum ResultCookieType
{
/// <summary>
/// 只返回字符串类型的Cookie
/// </summary>
String,
/// <summary>
/// CookieCollection格式的Cookie集合同时也返回String类型的cookie
/// </summary>
CookieCollection
}

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联系我时，请说是在挂海论坛上看到的，谢谢！

bestbobo · 发表于 2016-3-30 14:57:45

支持楼主，感谢楼主的分享，好贴必须学习！

微笑的面具 · 发表于 2016-3-30 16:05:03

打酱油的啦，飘过赚点海币而已。

suntian911 · 发表于 2016-9-2 22:38:33

支持楼主，感谢楼主的分享，好贴必须学习！

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HttpHelper类源码，方便网络抓取

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